The Black Diamond Rocklock Screwgate carabiner is one of Black Diamond's largest locking biners. The new Keylock has a non-snagging keylock nose. A slightly curved spine maximizes the gate opening and a square hinge end holds your belay loop securely in place. The Rocklock's large size makes it an excellent choice when using two ropes, wearing gloves, or when using a variety of belaying and rapelling techniques. Its large capacity can handle multiple clove hitches at belays. The Rocklock Carabiner is also easily operated with one hand.

Do yourself a favor and get 4 of these for your anchors per one top rope setup. There rock solid and burly big. Save my ultralights for belaying and anything else where I'll be carrying them on my person. These can take a lot of abuse and are my only preferred ones for setting up anchors. Petzl William are also a favorite to compare. Whether your starting out or looking for a rock solid anchor point, get these!